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Answer:
Explanation:
given,
body starts from rest ⇒ initial velocity (u) = 0
acceleration (a) = 4m/s²
1) given, time (t) = 4 s
displacement (s) = ?
from s = ut + at²/2
s = (0)4 + 2(4²)/2
s = 16 m
2) since, the question was not provided with the direction of particle,
it is to be assumed that particle travels in the same direction throughout the journey
in such case, distance = displacement
from above solution, distance travelled = 16 m
3) given, time (t) = 2 s
velocity (v) = ?
from a = (v - u)/t
v = u + at
= 0 + 2(2)
v = 4 m/s
4) nth second = 4th second
displacement at nth second (Sₙ) = ?
Sₙ = u + a(2n - 1)/2
= 0 + 2[2(4) - 1]/2
= 8 - 1
Sₙ = 7 m